machine gun turd
you’re taking a dump and you let out a series of loud farts that sound like a machine gun, just to make it extra nasty
I was pooping and I let out three farts in a row like a machine gun. It was glorious.
He was crapping and he started firing off farts like he was in a war.
She took a dump and let out a whole barrage of farts. It was like a fart battle.